Amazon is currently running a "buy three from this list, pay for just two" sale, which has a good number of Tolkien items in it:

https://www.amazon.com/promotion/psp/A ... collsguid-20&linkCode=osi

I do not know how long this promotion will be running, but there are some great prices at the moment (even before the free book offer)

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Letters From Father Christmas
Tolkien, J.R.R.
0618512659
(Paperback)
$14.99
Availability: Now

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J.R.R. Tolkien 4-Book Boxed Set: The Hobbit and The Lord of the Rings
Tolkien, J.R.R.
0345538374
(Mass Market Paperback)
$16.58
Availability: Now

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Pictures by J.R.R. Tolkien
Tolkien, J. R. R.
0358653045
(Hardcover)
$17.50
Availability: Now

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The Making of Middle-earth: The Worlds of Tolkien and The Lord of the Rings
Snyder, Christopher A.
1454944757
(Hardcover)
$24.02
Availability: Backorderable

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The Complete Tolkien Companion
Tyler, J. E. A.
9781250023551
(Kindle Edition)
$14.99
Availability: Now

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The Art Of The Lord Of The Rings By J.r.r. Tolkien
Tolkien, J.R.R.
0544636341
(Hardcover)
$24.99
Availability: Now

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J.R.R. Tolkien: A Biography
Carpenter, Humphrey
0618057021
(Kindle Edition)
$10.32
Availability: Now

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The Epic World of Tolkien: A Coloring Book
Editors of Thunder Bay Press
1645174581
(Paperback)
$13.10
Availability: Now

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John Ronald's Dragons: The Story of J. R. R. Tolkien
McAlister, Caroline
1626720924
(Hardcover)
$13.99
Availability: Backorderable

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A Secret Vice: Tolkien on Invented Languages
Tolkien, J. R. R.
000834809X
(Hardcover)
$26.99
Availability: Now

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J.r.r. Tolkien: Artist and Illustrator
0618083618
(Paperback)
$23.49
Availability: Now

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Understanding The Lord Of The Rings: The Best of Tolkien Criticism
Isaacs, Neil D
0618422536
(Paperback)
$12.99
Availability: Now